trace: switch position of headers to what Meson requires
[qemu.git] / hw / watchdog / wdt_ib700.c
1 /*
2 * Virtual hardware watchdog.
3 *
4 * Copyright (C) 2009 Red Hat Inc.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version 2
9 * of the License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
18 *
19 * By Richard W.M. Jones (rjones@redhat.com).
20 */
21
22 #include "qemu/osdep.h"
23 #include "qemu/module.h"
24 #include "qemu/timer.h"
25 #include "sysemu/watchdog.h"
26 #include "hw/isa/isa.h"
27 #include "migration/vmstate.h"
28
29 /*#define IB700_DEBUG 1*/
30
31 #ifdef IB700_DEBUG
32 #define ib700_debug(fs,...) \
33 fprintf(stderr,"ib700: %s: "fs,__func__,##__VA_ARGS__)
34 #else
35 #define ib700_debug(fs,...)
36 #endif
37
38 #define TYPE_IB700 "ib700"
39 #define IB700(obj) OBJECT_CHECK(IB700State, (obj), TYPE_IB700)
40
41 typedef struct IB700state {
42 ISADevice parent_obj;
43
44 QEMUTimer *timer;
45
46 PortioList port_list;
47 } IB700State;
48
49 /* This is the timer. We use a global here because the watchdog
50 * code ensures there is only one watchdog (it is located at a fixed,
51 * unchangeable IO port, so there could only ever be one anyway).
52 */
53
54 /* A write to this register enables the timer. */
55 static void ib700_write_enable_reg(void *vp, uint32_t addr, uint32_t data)
56 {
57 IB700State *s = vp;
58 static int time_map[] = {
59 30, 28, 26, 24, 22, 20, 18, 16,
60 14, 12, 10, 8, 6, 4, 2, 0
61 };
62 int64_t timeout;
63
64 ib700_debug("addr = %x, data = %x\n", addr, data);
65
66 timeout = (int64_t) time_map[data & 0xF] * NANOSECONDS_PER_SECOND;
67 timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + timeout);
68 }
69
70 /* A write (of any value) to this register disables the timer. */
71 static void ib700_write_disable_reg(void *vp, uint32_t addr, uint32_t data)
72 {
73 IB700State *s = vp;
74
75 ib700_debug("addr = %x, data = %x\n", addr, data);
76
77 timer_del(s->timer);
78 }
79
80 /* This is called when the watchdog expires. */
81 static void ib700_timer_expired(void *vp)
82 {
83 IB700State *s = vp;
84
85 ib700_debug("watchdog expired\n");
86
87 watchdog_perform_action();
88 timer_del(s->timer);
89 }
90
91 static const VMStateDescription vmstate_ib700 = {
92 .name = "ib700_wdt",
93 .version_id = 0,
94 .minimum_version_id = 0,
95 .fields = (VMStateField[]) {
96 VMSTATE_TIMER_PTR(timer, IB700State),
97 VMSTATE_END_OF_LIST()
98 }
99 };
100
101 static const MemoryRegionPortio wdt_portio_list[] = {
102 { 0x441, 2, 1, .write = ib700_write_disable_reg, },
103 { 0x443, 2, 1, .write = ib700_write_enable_reg, },
104 PORTIO_END_OF_LIST(),
105 };
106
107 static void wdt_ib700_realize(DeviceState *dev, Error **errp)
108 {
109 IB700State *s = IB700(dev);
110
111 ib700_debug("watchdog init\n");
112
113 s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, ib700_timer_expired, s);
114
115 portio_list_init(&s->port_list, OBJECT(s), wdt_portio_list, s, "ib700");
116 portio_list_add(&s->port_list, isa_address_space_io(&s->parent_obj), 0);
117 }
118
119 static void wdt_ib700_reset(DeviceState *dev)
120 {
121 IB700State *s = IB700(dev);
122
123 ib700_debug("watchdog reset\n");
124
125 timer_del(s->timer);
126 }
127
128 static WatchdogTimerModel model = {
129 .wdt_name = "ib700",
130 .wdt_description = "iBASE 700",
131 };
132
133 static void wdt_ib700_class_init(ObjectClass *klass, void *data)
134 {
135 DeviceClass *dc = DEVICE_CLASS(klass);
136
137 dc->realize = wdt_ib700_realize;
138 dc->reset = wdt_ib700_reset;
139 dc->vmsd = &vmstate_ib700;
140 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
141 }
142
143 static const TypeInfo wdt_ib700_info = {
144 .name = TYPE_IB700,
145 .parent = TYPE_ISA_DEVICE,
146 .instance_size = sizeof(IB700State),
147 .class_init = wdt_ib700_class_init,
148 };
149
150 static void wdt_ib700_register_types(void)
151 {
152 watchdog_add_model(&model);
153 type_register_static(&wdt_ib700_info);
154 }
155
156 type_init(wdt_ib700_register_types)